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XBONG

(X-ray bright optical normal galaxy)
(galaxy bright with X-rays but with no evident AGN)

XBONG (for X-ray bright optical normal galaxy) is a classification for galaxies in which no active galactic nucleus (AGN) is evident (e.g., not a Seyfert galaxy), yet show substantial X-ray luminosity.


(galaxy type)
https://en.wikipedia.org/wiki/Glossary_of_astronomy#X
https://arxiv.org/abs/astro-ph/0412335

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